What are the most common causes of an SSL handshake failed host error?

Several factors can contribute to this error. Common causes include: 1) **Server certificate issues:** The certificate might be expired, self-signed, invalid, or not properly configured. 2) **Mismatched SSL/TLS protocols or ciphers:** The client and server might not support a mutually compatible combination of security protocols and encryption algorithms. 3) **Network connectivity problems:** Firewalls, proxies, or network configurations could be blocking the connection. 4) **Incorrect date/time on client or server:** SSL certificates have validity periods, and incorrect system time can cause certificate validation to fail. 5) **Client-side issues:** Outdated browser or application, conflicting security software, or corrupted SSL/TLS libraries.